Atari 2600: Lasercade
Best described as a 3-D shooting gallery, Lasercade is an odd little game designed by Videa. It was never released.
The goal of the game is to shoot all the targets in the upper section of the screen before time runs out.
In the middle section of the the screen there are three rotating mirrors. As you may have guessed, these mirrors can play havoc with your laser if you're not careful. If you shoot a mirror while it is facing you, it will reflect the laser back at you and you will lose some time and be momentarily stunned. However if you shoot the mirror while its back is to you, you can destroy it so it won't bother you until the next round. The number of mirrors can be controlled with the left difficulty switch.